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Tung oil has been used for hundreds of years in China, where it was used as a preservative for wood ships. The oil penetrates the wood, and then hardens to form an impermeable hydrophobic layer up to 5 mm into the wood. As a preservative it is effective for exterior work above and below ground, but the thin layer makes it less useful in practice.
Copper naphthenate is classified by EPA as a general use (i.e., a non-restricted use) pesticide by virtue of its relatively benign toxicity profile. [5] Copper naphthenate is the only non-restricted use wood preservative in widespread use for "heavy duty" commodities such as utility poles, railroad crossties and timbers, pilings and fence posts.
non-toxic (preservatives excepted) Once wet, 6–7 hours. ~4 hours for softwood, 8 for hardwood; must be under pressure for >0.5-2 hrs tensile strength exceeds most woods, 2,200-3,00 pounds per square inch water-resistant, depending on alkalis used Woodworking, paper glue, fireproof laminates Medieval or earlier Soybean glue
Chromated copper arsenate (CCA) is a wood preservative containing compounds of chromium, copper, and arsenic, in various proportions. It is used to impregnate timber and other wood products, especially those intended for outdoor use, in order to protect them from attack by microbes and insects. Like other copper-based wood preservatives, it ...
Acetylated wood is a type of modified wood that is produced through a chemical modification process and does not contain any toxic substances. [1] It produced from a chemical reaction (named as acetylation), involving acetic anhydride and a modification process to make wood highly resistant to biological attacks by fungi and wood-boring insects and durable to environmental conditions.
But, it remains under close monitoring as it is a relatively new preservative for cosmetic products and will presumably increase in usage [Sasseville, 2004]. Most human patch tests performed before 2004 were with 0.1% IPBC solutions, i.e. 10 times the concentration used in many cosmetic products.